Dan Saffer’s recent book, Designing Gestural Interfaces, makes you think anew about the hand dryers and faucets in public restrooms that respond to waving hands. In fact, Dan notes that gestural interfaces are currently found in specialized products paired to specialized activities in specialized environments. As he observes,

Public restrooms are currently a great example of this, but other spaces could easily take on this sort of “hothouse” environment. The next likely place for such experimentation is kitchens: they feature lots of activities, plus a contained environment with tons of specialized equipment (pp. 160-161)

Designing Gestural Interfaces is the first attempt I’ve seen to provide an in-depth discussion of the challenges in designing devices that people control through gesturing. Although it isn’t the central point of the book, Dan discusses restroom interfaces that wet hands, dry hands, flush toilets, and dispense SaniSeats. And one of his example photographs is notated, “Apparently, public restrooms are excellent places to find gestural interfaces.”